Wash basin



FIG. 1 is a perspective view taken from the top, front and right side of a wash basin showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof, the left side being a mirror image of the right side shown; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a wash basin, substantially as shown and described. 